Same. It removes the ability to have plausible deniability of “oh I just forgot to tag it”—no, if you tagged it “non-AI” and it was actually vibe-coded, you clearly deliberately and consciously lied.

I’ve never seen it on the official web app. I suspect that, if they existed, I would’ve seen them used by now.

But mandating [NOT AI] means that people have to go out of their way to declare their work is AI-free. It requires active lying rather than lying by omission—I think there are a non-zero number of people who would be inclined to omit an AI tag but would not want to go as far as explicitly lying about their work being AI-free.

I would support those tags. Does Lemmy support some equivalent of post flairs that can be filtered?

if I aggressively block each offender in my logs permanently, then the next person assigned this IP who may be a legitimate user will be unable to access my site.

temp bans exist for this reason. You can use something like fail2ban for it, or that may be overkill for your purposes, but any mechanism that blocks the IP address for a short amount of time will work. My f2b blocks spammers’ IP addresses for a day, and I don’t see repeat bans which means the spammers aren’t coming back on the same IP address, so the short ban works to stop a given spam attack.